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Bi tp lm thm
Cu 1. Cho cht X vo dung dch H2SO4 long, d thu c dung dch Y. Dung
dch
Y ho tan c Cu v lm mt mu dung dch KMnO4. Vy X l cht no sau
y?
A. Fe3O4 B. Fe C. FeO D. Fe2O3
Cu 2. Cho m gam Fe3O4 vo dung dch H2SO4 d thu c dung dch X. 1/2
dung
dch X lm mt mu va ht 100 ml dung dch KMnO4 0,1M. Hy cho bit 1/2
dung
dch X cn li ho tan ti a bao nhiu gam Cu.
A. 1,6 gam B. 4,8 gam C. 3,2 gam D. 6,4 gam
Cu 3. Cho cht X vo dung dch HNO3 c, nng d, sau phn ng hon ton th
thu
72,6 gam mui Fe(NO3)3 v thy thot ra 2,24 lt kh (ktc). Vy cht X c
th l:
A. Fe2O3 B. Fe C. Fe3O4 D. FeO
Cu 4. ho tan hon ton 4,64 gam hn hp gm FeO, Fe3O4 v Fe2O3 (trong
s
mol FeO bng s mol Fe2O3), cn dng va V lt dung dch H2SO4 1M. Gi
tr ca
V l:
A. 0,16 B. 0,08 C. 0,18 D. 0,24
Cu 5. Cho 5,6 gam bt Fe vo 200 ml dung dch HNO3 2,4M v HCl 1,0M
thu c
dung dch X. Hy cho bit dung dch X c th ho tan ti a bao nhiu gam
Cu. Bit
rng NO l sn phm kh duy nht ca NO-3
A. 5,12 gam B. 6,72 gam C. 9,92 gam D. 3,2 gam
Cu 6. Ha tan hon ton 20,88 gam mt oxit st bng dung dch H2SO4 c,
nng thu
c dung dch X v 3,248 lt kh SO2 (sn phm kh duy nht, ktc). C cn
dung
dch X, thu c m gam mui sunfat khan. Gi tr ca m l:
A. 48,4 B. 52,2 C. 58,0 D. 54,0
Cu 7. Cho 61,2 gam hh X gm Cu v Fe3O4 tc dng vi dd HNO3 long, un
nng
v khuy u. Sau P hon ton, thu c 3,36 lt kh NO (sn phm kh duy
nht,
ktc), dd Y v cn li 2,4 gam kim loi. C cn dd Y, thu c m gam mui
khan. Gi
tr ca m l:
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A. 151,5 B. 108,9 C. 137,1 D. 97,5
Cu 8. Cho m gam hn hp X gm FeO, Fe2O3, Fe3O4 vo mt lng va
dung
dch HCl 2,0M, thu c dung dch Y c t l s mol Fe2+ v Fe3+ l 1 : 2.
Chia Y
thnh hai phn bng nhau. C cn phn mt thu c m1 gam mui khan. Sc kh
clo
(d) vo phn hai, c cn dung dch sau phn ng thu c m2 gam mui khan.
Bit:
m2 - m1 = 0,71. Th tch dung dch HCl dng l:
A. 240 ml B. 160 ml C. 320 ml D. 80 ml
Cu 9. Cho 4,48 lt kh CO ( ktc) t t i qua ng s nung nng ng 8 gam
mt
oxit st n khi phn ng xy ra hon ton. Kh thu c sau phn ng c t khi
so
vi hiro bng 20. Cng thc ca oxit st v phn trm th tch ca kh CO2
trong hh
kh sau phn ng l:
A. Fe3O4; 75% B. Fe2O3; 65% C. Fe2O3; 75% D. FeO; 75%
Cu 10. Cho kh CO i qua 32,0 gam Fe2O3 nung nng, sau phn ng thu c
cht
rn X v kh CO2. Hp th ht kh CO2 bng nc vi trong d th thu c 40,0
gam
kt ta. ha tan va ht cht rn X cn dng 450,0 ml dung dch H2SO4 1,0M
ng
thi phn ng gii phng V lt kh H2 (ktc). Vy gi tr ca V tng ng l
:
A. 4,48 lt B. 3,36 lt C. 6,72 lt D. 5,60 lt
Cu 11. Cho hn hp gm 1,12 gam Fe v 1,92 gam Cu vo 400 ml dung dch
cha
hn hp gm H2SO4 0,5M v NaNO3 0,2M. Sau khi cc phn ng xy ra hon
ton,
thu c dung dch X v kh NO (sn phm kh duy nht). Cho V ml dung dch
NaOH
1M vo dung dch X th lng kt ta thu c l ln nht. Gi tr ti thiu ca V
l:
A. 360 ml B. 400 ml C. 240 ml D. 120 ml
Cu 12. Cho kh H2 qua m gam Fe2O3 nung nng thu c cht rn X v 9,0
gam
H2O. ha tan hon ton X cn dng 500,0 ml dung dch H2SO4 1,0M, ng
thi
phn ng gii phng 2,24 lt kh H2 (ktc). Vy gi tr ca m l :
A. 48 gam B. 40 gam C. 24 gam D. 32 gam
Cu 13. Trong cc loi qung st, qung c hm lng st cao nht l:
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A. hematit B. manhetit C. hematit nu D. xierit
Cu 14. Cho cht X tc dng va vi 100,0 ml dung dch HCl 2,0 M th thu
c
dung dch Y. Cho Y tc dng vi dung dch AgNO3 d th thu c 31,4 gam
kt ta.
Vy cht X c th l:
A. Fe3O4 B. Fe C. Fe2O3 D. FeO
Cu 15. Cho 40,0 gam hn hp X gm Fe v Fe3O4 (t l mol 3 : 1) vo
dung dch
HNO3 long, nng thu c kh NO v cn li 2,8 gam Fe cha tan. Tnh th
tch kh
NO thot ra (ktc). Bit NO l sn phm kh duy nht ca HNO3?
A. 3,36 lt B. 2,24 lt C. 4,48 lt D. 6,35 lt
Cu 16. Cho 9,12 gam hn hp gm FeO, Fe2O3, Fe3O4 tc dng vi dung
dch HCl
(d). Sau khi cc phn ng xy ra hon ton, c dung dch Y; c cn Y thu
c
7,62 gam FeCl2 v m gam FeCl3. Gi tr ca m l:
A. 7,80 B. 8,75 C. 9,75 D. 6,50
Cu 17. Cho 11,36 gam hn hp gm Fe, FeO, Fe2O3 v Fe3O4 phn ng ht
vi dung
dch HNO3 long (d), thu c 1,344 lt kh NO (sn phm kh duy nht, ktc)
v
dung dch X. C cn dung dch X thu c m gam mui khan. Gi tr ca m
l
A. 35,50 B. 49,09 C. 38,72 D. 34,36
Cu 18. C cc cht rn sau: Fe3O4, Fe2O3, CuO v MgO. S dng ho cht no
sau
y c th nhn bit c cc cht rn .
A. dung dch HNO3 B. dung dch H2SO4 long
C. dung dch HCl D. dung dch CuSO4
Cu 19. m gam bt st ngoi khng kh, sau mt thi gian thu c 1,2m gam
hn
hp cht rn X. Ha tan hon ton X trong dung dch H2SO4 c, nng thu c
1,792
lt SO2 (ktc). Xc nh m?
A. 4,2 gam B. 5,6 gam C. 8,4 gam D. 7,0 gam
Cu 20. Qu trnh kh Fe2O3 bng CO trong l cao, nhit khong
500-6000C, c
sn phm chnh l :
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A. Fe3O4 B. Fe C. FeO D. Fe2O3
1 2 3 4 5 6 7 8 9 10 A C C B C C A B C D 11 12 13 14 15 16 17 18
19 20 A A B A B C C A B C
